Design method of active filter capable of simultaneously compensating reactive power and controlling harmonic waves

Abstract

The invention relates to a design method of an active filter capable of compensating reactive power and controlling harmonic waves simultaneously. A primary system of the active filter comprises a turn-off device converter valve and a connecting device. The turn-off device converter valve is connected to an alternating current bus through a connecting device, and the alternating current bus is connected with an alternating current system and a harmonic source. The connecting equipment comprises a connecting transformer and a connecting passive filter which are connected in parallel; comprising the following steps: performing equivalent analysis on the active filter to obtain an equivalent circuit diagram of the active filter, and performing harmonic analysis and fundamental frequency analysis on the active filter based on the equivalent circuit diagram; and designing equipment elements of the active filter based on the equivalent circuit diagram of the active filter and harmonic analysis and fundamental frequency analysis results. The method can be widely applied to the field of power transmission system design.

Description

[0001] This application is a divisional application with an application number of 202011022716.3, an application date of September 25, 2020, and an invention-creation title of "active filter and control and design method for simultaneously compensating reactive power and controlling harmonics". technical field [0002] The invention relates to a design method of an active filter for compensating reactive power and controlling harmonics at the same time, and belongs to the field of power transmission system design. Background technique [0003] The LCC DC converter project will consume a lot of reactive power and generate a lot of harmonics, mainly the 12th, 24th and other characteristic harmonics and the 3rd and 5th non-characteristic harmonics. Therefore, a large number of AC filters must be installed. Therefore, the AC filter field composed of AC filters and parallel capacitors occupies nearly half of the area of ​​the LCC DC converter station, and it costs a lot of investm...

AI Technical Summary

Problems solved by technology

This is because the harmonics generated by the converter are mostly high-order characteristic harmonics such as the 12th and 24th, which are easy to pass through capacitive devices such as capacitors, while reactive power compensation equipment is essentially to compensate the fundamental frequency current, which is easy to Flowing through inductive devices such as inductors, active filter devices often cannot take into account both fundamental frequency reactive power compensation and high frequency filtering at the same time, so they cannot replace passive filters that are both reactive power compensation devices and filter devices on the AC side

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